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4x-(15-x)=86
We move all terms to the left:
4x-(15-x)-(86)=0
We add all the numbers together, and all the variables
4x-(-1x+15)-86=0
We get rid of parentheses
4x+1x-15-86=0
We add all the numbers together, and all the variables
5x-101=0
We move all terms containing x to the left, all other terms to the right
5x=101
x=101/5
x=20+1/5
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